well they do take daily attention and usually weekly or monthly maintenance, but as far as the amount of work it takes me longer to work on my oscar tank then it does to do what needs to be done on my saltwater tank.... that is because if properly setup a SW tank is basicly a perfect eco system... there are organisms that eat the waste of the lager oranisms and the live rock and deep sand beds process out all base waste products out to perfectly harmless nitrogen gas so a well set up tank will take absolutely no water changes. 10-15% a month is sometime recommended to maintain trace elements.
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Adam
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